Claude Opus 5.5 vs Grok 4.6
Claude Opus 5.5 (Anthropic) and Grok 4.6 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Grok 4.6 is cheaper on input tokens — $2.00 vs $4.00 per 1M.
- Claude Opus 5.5 has a larger context window (1M vs 500K tokens).
- Claude Opus 5.5 ranks higher for coding (100th vs 89th percentile).
| Attribute | Claude Opus 5.5 | Grok 4.6 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 156 |
| Coding | 100 | 89 |
| Math | — | 91 |
| Reasoning & Knowledge | 100 | 73 |
| Agentic & Tools | — | 95 |
| Specifications | ||
| Developer | Anthropic | xAI |
| Family | Claude | Grok |
| Released | Sep 22, 2026 | Aug 12, 2026 |
| Parameters | — | — |
| Availability | — | API access |
| Context window | 1M | 500K |
| Price — $/M input | $4.00 | $2.00 |
| Price — $/M output | $20.00 | $6.00 |
| Inputs | text, image, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| Humanity's Last Exam | 61% | 43% |
| SciCode | 67% | 56% |
| AIME 2024/2025 | — | 99% |
| APEX | — | 65% |
| ARC-AGI | — | 88% |
| ARC-AGI-2 | — | 67% |
| GPQA Diamond | — | 94% |
| SimpleBench | — | 76% |
| SimpleQA Verified | — | 49% |
| WebDev Arena | — | 1618 |
| WeirdML | — | 67% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, Claude Opus 5.5 or Grok 4.6?
Grok 4.6 is cheaper on input tokens at $2.00 per million, versus $4.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Opus 5.5 or Grok 4.6?
Claude Opus 5.5 supports up to 1M tokens, compared with 500K for the other.
Which is better for coding, Claude Opus 5.5 or Grok 4.6?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Claude Opus 5.5 ranks higher — 100th vs 89th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.